COD is an indicator that refers to the measurement of the content of organic substances in water. The higher the COD, the more serious the pollution of the water body by organic substances. Toxic organic matter entering the water body not only harms organisms in the water body such as fish, but also can be enriched in the food chain and then enter the human body, causing chronic poisoning. For example, chronic poisoning of DDT can affect the nervous system, destroy liver function, cause physiological disorders, and may even affect reproduction and genetics, produce freaks and cause cancer.
COD has a great impact on water quality and ecological environment. Once organic pollutants with elevated COD content enter rivers and lakes, if they cannot be treated in time, many organic substances may be absorbed by the soil at the bottom of the water and accumulate over the years. It will cause harm to all kinds of organisms in the water, and the poisonous effect will last for several years. This toxic effect has two effects:
On the one hand, it will cause a large number of deaths of aquatic organisms, destroy the ecological balance in the water body, and even directly destroy the entire river ecosystem.
On the other hand, toxins slowly accumulate in the bodies of aquatic organisms such as fish and shrimp. Once humans eat these poisoned aquatic organisms, the toxins will enter the human body and accumulate over the years, causing cancer, deformity, gene mutation, etc. Unpredictable serious consequences.
When the COD is high, it will cause the deterioration of the water quality of the natural water body. The reason is that the self-purification of the water body needs to degrade these organic substances. The degradation of COD must consume oxygen, and the reoxygenation capacity in the water body cannot meet the requirements. It will directly drop to 0 and become an anaerobic state. In the anaerobic state, it will continue to decompose (anaerobic treatment of microorganisms), and the water body will turn black and smelly (anaerobic microorganisms look very black and produce hydrogen sulfide gas. ).
The use of portable COD detectors can effectively prevent excessive COD content in water quality.
The portable COD analyzer is widely used in the determination of surface water, groundwater, domestic sewage and industrial wastewater. It is not only suitable for field and on-site rapid water quality emergency testing, but also for laboratory water quality analysis.
Standards compliant
HJ/T 399-2007 Water Quality – Determination of Chemical Oxygen Demand – Rapid Digestion Spectrophotometry
JJG975-2002 Chemical Oxygen Demand (COD) Meter
Post time: Apr-13-2023
